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    Process for producing hydrogen fluoride and phosphoric acid
    1.
    发明授权
    Process for producing hydrogen fluoride and phosphoric acid 失效
    氟化氢和磷酸的生产方法

    公开(公告)号：US4292289A

    公开(公告)日：1981-09-29

    申请号：US121486

    申请日：1980-02-14

    Applicant: Curtis W. Cannon ,  Robert N. Hall

    Inventor： Curtis W. Cannon ,  Robert N. Hall

    IPC: C01B7/19 ,  C01B25/10 ,  C01B25/18 ,  C01B25/22 ,  C01B25/16

    CPC classification number: C01B7/192 ,  C01B25/10 ,  C01B25/185 ,  C01B25/2208

    Abstract: An improved method for producing hydrogen fluoride from fluoride bearing ores, such as fluorospar and fluorapatite, by reaction of the ore as a slurry in fluorosulfonic acid. The slurry is heated by the exothermic heat of the reaction to vaporize volatile phosphorous compounds and substantial quantities of hydrogen fluoride. The calcium fluoride is substantially reacted to form hydrogen fluoride. High silica fluorospar ores can be used since silicon tetrafluoride is not formed with fluorosulfonic acid. Another feature provides for addition of calcium fluoride to the slurry to react with the by-product sulfuric acid in the residual solids to eliminate the sulfuric acid recovery step in the process. Hydrogen fluoride produced is recovered, together with the hydrogen fluoride produced from the hydrolysis or pyrolysis of the intermediate fluorophosphorous compounds. Additionally, at least a portion of the hydrogen fluoride can be reacted with sulfur trioxide to form fluorosulfonic acid for makeup in the process.

    Abstract translation: 通过矿石作为浆料在氟磺酸中反应，从含氟矿石，如氟碳和氟磷灰石生产氟化氢的改进方法。 通过反应的放热加热浆料以蒸发挥发性磷化合物和大量的氟化氢。 氟化钙基本上反应形成氟化氢。 可以使用高二氧化硅荧光矿石，因为四氟化硅不与氟磺酸形成。 另一个特征提供了将氟化钙添加到浆料中以与剩余固体中的副产物硫酸反应以消除该方法中的硫酸回收步骤。 产生的氟化氢与中间体氟代磷化合物的水解或热解产生的氟化氢一起被回收。 此外，氟化氢的至少一部分可与三氧化硫反应形成氟磺酸，用于在该方法中进行化妆。

    Process for manufacturing ammonium phosphate utilizing an oxalic acid acidulating process
    3.
    发明授权
    Process for manufacturing ammonium phosphate utilizing an oxalic acid acidulating process 失效
    使用草酸酸化方法制造磷酸铵的方法

    公开(公告)号：US4390509A

    公开(公告)日：1983-06-28

    申请号：US254647

    申请日：1981-04-16

    Applicant: Charles W. Weston ,  Padraic S. O'Neill

    Inventor： Charles W. Weston ,  Padraic S. O'Neill

    IPC: C01B25/22 ,  C01B25/28 ,  C01F11/18 ,  C01B15/16 ,  C01B25/26

    CPC classification number: C01B25/2208 ,  C01B25/28 ,  C01F11/18

    Abstract: A process for the manufacture of phosphoric acid from phosphate rock is provided. The phosphate rock is digested or acidulated with an acid solution containing oxalic acid to produce phosphoric acid and calcium oxalate. Useful by-products are also formed and include calcium carbonate and ammonium oxalate. More specifically, the process provides for the production of phosphoric acid, ammonium phosphate and useful by-products utilizing synthesis gas and air to produce oxalic acid and ammonia. The synthesized oxalic acid is utilized for phosphate rock digestion to produce phosphoric acid, which can be reacted with ammonia to produce ammonium phosphate. Calcium oxalate from phosphate rock digestion is utilized to produce calcium carbonate, ammonium oxalate and oxamide.

    Abstract translation: 提供了一种从磷酸盐岩制造磷酸的方法。 用含草酸的酸溶液消化或酸化磷酸盐岩以产生磷酸和草酸钙。 还形成有用的副产物，包括碳酸钙和草酸铵。 更具体地，该方法提供了使用合成气和空气生产磷酸，磷酸铵和有用的副产物以产生草酸和氨。 合成的草酸用于磷酸盐岩石消解，产生磷酸，可与氨反应产生磷酸铵。 来自磷酸盐岩石消解的草酸钙用于生产碳酸钙，草酸铵和草酰胺。

    Process for making crude phosphoric acid
    5.
    发明授权
    Process for making crude phosphoric acid 失效
    制备粗磷酸的方法

    公开(公告)号：US4780294A

    公开(公告)日：1988-10-25

    申请号：US10333

    申请日：1987-02-03

    Applicant: Gunther Schimmel ,  Friedrich Kolkmann ,  Reinhard Gradl ,  Herbert Ressel

    Inventor： Gunther Schimmel ,  Friedrich Kolkmann ,  Reinhard Gradl ,  Herbert Ressel

    IPC: C01B25/222 ,  C01B25/22 ,  C01B25/223 ,  C01B25/16 ,  C01B17/16

    CPC classification number: C01B25/2208 ,  C01B25/223

    Abstract: Crude phosphoric acid is made by subjecting crude phosphate ore containing sulfide to processing treatment with a mineral acid in a closed system comprised of a processing reactor, a filtering zone and an off-gas scrubbing zone. To this end, a soluble compound of a metal forming difficultly soluble sulfides in the respective acid medium is added either(A) during the processing operation the phosphate ore is subjected to or(B) during the scrubbing operation the off-gas is subjected toand the resulting sulfide precipitate is filtered off in case (A) together with further matter precipitated during the processing operation and, in case (B) separated from the scrubbing liquid.

    Abstract translation: 粗磷酸是通过在含有加工反应器，过滤区和废气洗涤区的封闭系统中，使含有硫化物的粗磷酸盐矿石与无机酸进行处理而制成的。 为此，在各种酸性介质中形成难以溶解的硫化物的金属的可溶性化合物在（a）在磷酸盐矿石经历的处理操作期间或（B）中加入废气进行处理 并且在（A）的情况下将所得的硫化物沉淀与在处理操作期间沉淀的另外的物质一起被滤出，并且在与洗涤液分离的情况下（B）。

    Method for producing phosphoric acid
    9.
    发明申请
    Method for producing phosphoric acid 有权
    磷酸生产方法

    公开(公告)号：US20040013594A1

    公开(公告)日：2004-01-22

    申请号：US10343644

    申请日：2003-04-03

    Inventor： Mohamed Takhim

    IPC: C01B025/22

    CPC classification number: C01B25/222 ,  C01B25/2208

    Abstract: The invention concerns a method for producing phosphoric acid, which consists in: at least an attack of phosphate ore with an attacking liquid containing soluble phosphate ions, forming of an attacking product, separating in the attacking product between an insoluble solid phase containing impurities and a liquid phase having soluble phosphate ions and calcium ions, introducing in the separated liquid phase an acid stronger than phosphoric acid and which forms, with said calcium ions, a soluble calcium salt, and isolating a solution of said calcium salt, not contaminated by the impurities, thereby obtaining a phosphoric acid solution.

    Abstract translation: 本发明涉及一种生产磷酸的方法，该方法包括：至少使磷矿与含有可溶性磷酸根离子的攻击液进行攻击，形成攻击产物，在攻击产物中分离含有杂质的不溶性固相和 具有可溶性磷酸根离子和钙离子的液相，在分离的液相中引入比磷酸更强的酸，并与所述钙离子形成可溶性钙盐，并分离所述钙盐的溶液，而不被杂质污染 ，从而得到磷酸溶液。

    Method for manufacture of phosphoric acid from phosphate rock
    10.
    发明授权
    Method for manufacture of phosphoric acid from phosphate rock 失效
    从磷酸盐岩制造磷酸的方法

    公开(公告)号：US4108957A

    公开(公告)日：1978-08-22

    申请号：US761855

    申请日：1977-01-24

    Applicant: Robert Michel

    Inventor： Robert Michel

    IPC: C07C55/06 ,  C01B25/22 ,  C01F11/46 ,  C07C51/00 ,  C07C67/00 ,  C22B60/02 ,  C01G43/00

    CPC classification number: C22B60/0282 ,  C01B25/2208 ,  C01F11/46 ,  C22B60/0243

    Abstract: A method is disclosed for the manufacture of phosphoric acid directly from phosphate rock wherein the crushed phosphate rock is mixed with dilute phosphoric acid to form a slurry and the slurry is then heated to produce calcium monophosphate. Thereafter, oxalic acid is added to the slurry to precipitate the calcium therein as calcium oxalate which is separated. The liquid resulting therefrom which contains the phosphoric acid from the rock is then treated conventionally to recover the phosphoric acid therein.

    Abstract translation: 公开了一种直接从磷酸盐岩石制造磷酸的方法，其中将粉碎的磷酸盐岩与稀磷酸混合以形成浆料，然后将浆料加热以产生单磷酸钙。 此后，将草酸加入到浆料中以将其分离出的草酸钙沉淀在其中。 然后将从其中得到的含有来自岩石的磷酸的液体常规地处理以回收其中的磷酸。

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